Hi I am using 2 D pipe I consider it as a rectangle with four vertices I increases the number of mesh near the wall by using first length and last length options available with mesh edges menu so I need to ask : is it necessary to create BL near the wall in this case?

Thanks to any notes Salam

Is there anybody can answer my last question? I need to know if my simulations is correct without BL or no? pls guide me.

Thanks salam

As i Know , absolutely yeah ;